Yu Yureka is an old model now, there is a better version of it called Yu Yureka plus. Besides, in such range there is redmi 3S Prime and Lenovo K5 Plus. If you want a good phone, you can go for these models

Yes, YU Yureka is eligible for Jio Welcome Offer, in fact, any device which has 4G connectivity is eligible for the same.However, you won't be able to use VoLTE technology and for that, you can use JioJoin app from Jio and make HD voice and video calls.